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Not directly. The 18-55mm takes 52mm filters. However, you could purchase a 52-58 step-up ring to allow you to adapt the filter to the lens for significantly less money than a 52mm UV filter. One such adapter is http://www.adorama.com/IRXRA5852.html

Without specific reference to the D90, the following applies to almost all dSLR's: Skylight filters (UV) are fine, but avoid using auto white balance. Polarisers can prevent the autofocus system from working, but the more expensive circular polarisers are usually OK although don't produce quite the same effect as linear polarisers.

I do not think any company makes an Fisheye lens attachment for Nikon P80.
This is a fixed lens camera.
If it is being manufactured by any 3rd party then Nikon then you can only attach it to the front of the P80's lens.
Caution.
Nikon P80 is a super zoom and lens barrel is made up of plastic that is too light weight. Do not attach heavy peace of metal on the lens. it can only carry the filters.

Hi, allow me to suggest using another lens to see if you still see the dark patches in the top corners. If not it is the lens, if so it is the camera. Either way it sounds as though something is maladjusted. Call Nikon digital 1-800-645-6689.

Under some circumstances when using the Coolpix 4500 attached to a microscope concentric rings are visible as in the below.
The COOLPIX 4500 aspherical lens surface is ground to create the ideal curves to gather rays at the focal point with an extremely high accuracy. Such minute lines are not visible in the image taken with a camera alone, however if the camera is used with a microscope, the lines become visible as the depth of field is increased due to the combined F numbers of the camera lens and microscope lenses.